You're right. I was thinking about using 25lb plates instead of 45s to get the bar lower.
My wrists were killing me too with the 'finished clean' style grip. I wasn't able to hold any more than 95lbs holding the bar the other way. I was using 155 with the clean grip.
I just did Hack Squats again today, and wasn't able to finish, so I had to go on to front squats to finish my sets. My grip failed to hold the weight, even with straps >:[
My grip has always been a problem, and now it's getting ridiculous. I've been working on it seperatley and it's been getting better with deads, but still not where I need it to be.
Chalk up another point for Front Squats. If you have a pussy grip like me and can't hold your Hack Squat weight, you can go to Front Squats.
I'm going to start trying the hook grip that CT has talked about a few times. I think I won't be feeling my thumb for a month or so though.